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能量桩是1种新型桩基埋管地源热泵技术,在传递上部荷载的同时获取地热能源;但是目前对于桩土之间的相互作用以及桩体的热力学效应却研究较少。基于模型试验方法,采用打夯法和砂雨法,对饱和砂土中不同压实度下的桩体热力学效应和承载特性进行对比研究。试验测得桩体和桩周土体温度变化、桩周土体水平压力变化、桩体应变应力以及桩顶位移。结果表明,加热时,桩周土体会有水平土压力的增大,桩体内部会有压应力的产生,桩顶会产生向上的位移,并且压实度越大,桩周水平土压力越大,桩体应力越大,桩顶位移变化越小。
Energy pile is a new type of buried pipe ground source heat pump technology, which can obtain geothermal energy while transferring the upper load. However, there is little research on the interaction between pile and soil and the thermodynamic effect of pile. Based on the model test method, the thermodynamic effect and bearing characteristics of pile under different compaction degrees in saturated sand were compared by using the method of sand compacting and sand ramming. The temperature change of the soil around the pile and the pile, the horizontal pressure change of the soil around the pile, the strain and stress of the pile and the displacement of the pile top are measured by the test. The results show that when the soil is heated, there will be an increase of the horizontal soil pressure, and there will be compressive stress inside the pile body, and upward displacement will occur at the pile top. The greater the compaction degree is, The larger the pile stress is, the smaller the pile top displacement changes.